Malicious PDF — malware analysis report

Static analysis result for SHA-256 145c913fabb5ddc9…

MALICIOUS

PDF

90.8 KB Created: 2021-10-06 03:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d14fe08e1a67208feb80dd450e1f204e SHA-1: bfb9d8c1e629cb32d6fdbc3cd2289b85db6f8a69 SHA-256: 145c913fabb5ddc963dd2f75b66fa0c5aa973882d1a8e574442106bb97db0425
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request, intended to trick the user into clicking one of the malicious links. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=special+days+in+may+2021 PDF link annotation
    • http://cuacuonductudong.com/upload/files/37762520717.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///26047262220.pdfIn PDF document text
    • https://birudongker.com/contents/files/buxib.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/79159244715.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/28127154605.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/82963416922.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f8982f7c---90633277288.pdfIn PDF document text
    • http://cobweb.janci.net/upload/files/43162792131.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/dasatoli.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/kizifil.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/75172570821.pdfIn PDF document text
    • https://ismart99.net/upload/files/muxeneraxetatevifi.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65411e32c---28010411181.pdfIn PDF document text
    • https://telorgabus.com/contents/files/14880723253.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/54285225323.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/79932819677.pdfIn PDF document text
    • http://chinahongji.com/d/files/81552044458.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/vadidexowefejanigif.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/letavumikofironokusapon.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/67928664236.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/sutamezimek.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mezojuparudepalepop.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/47514380154.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/93977267895.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/zebijamonosorimevonanep.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/wusexidusinu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/988a88677ce28d6e1c8307260ffa4480/79641001199.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 18844 bytes
SHA-256: 9f771da02cea6075822ddd76d98d49dd7d3cfd360ae8a55d0aea708688067d51
font_01_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 10840 bytes
SHA-256: 0f25ef60fbd10543525e61599fbb87ea5fa076132a1903c70ef7feb540894e61
font_02_sfnt_off0001454f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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